ratio IQ

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The original but now obsolete conception of IQ, introduced in 1912 by the German psychologist (Louis) William Stern (1871–1938), as a ratio of mental age (MA) to chronological age (CA). Although Stern's original quotient was this MA/CA, in 1916 the US psychologist Lewis Madison Terman (1877–1956) modified it to (MA/CA) × 100, to express mental age as a percentage of chronological age and to eliminate awkward decimals. Since the publication of The Measurement of Intelligence in 1944 by the Romanian-born US psychologist David Wechsler (1896–1981), the standard definition of IQ has been the purely statistical deviation IQ.

Subjects: Psychology.

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